LAUSR

Abstract Introduction Maternal characteristics and mother–adolescent relationships are thought to affect the emotional development of adolescents. Adolescents can learn to regulate their emotions by observing their mothers, and this is further facilitated by maternal autonomy support. Therefore, this study longitudinally examined the associations among maternal emotion dysregulation, maternal autonomy support, and adolescent emotion dysregulation. Method Participants were 466 Dutch adolescents (54.51% males; M age  = 14.03, SD = 0.45) and 462 mothers (M age  = 45.49, SD = 4.47), who completed self‐reports of emotion dysregulation and maternal autonomy support for five consecutive years. Results Random Intercept‐Cross Lagged Panel Model analyses showed that at the between‐family level, maternal emotion dysregulation was correlated with adolescent emotion dysregulation, adolescent‐reported maternal autonomy support, and mother‐reported maternal autonomy support; and adolescent emotion dysregulation was correlated with adolescent‐reported maternal autonomy support. At the within‐family level, higher than usual maternal emotion dysregulation was positively related to adolescent emotion dysregulation at Time 1, yet, was negatively related to adolescent emotion dysregulation at other time points concurrently, and predicted lower adolescent emotion dysregulation in the next year. Also, higher than usual adolescent emotion dysregulation was related to lower adolescent‐reported maternal autonomy support both concurrently and the next year. Conclusions Both mothers and adolescents played an important role in adolescent emotional development. To promote adolescent emotional development, it is important to target both maternal emotion dysregulation to understand the development of adolescent emotion dysregulation, and adolescent emotion dysregulation to prevent mothers from providing less autonomy support to their adolescents.